JP2004076443A - Connecting structure and connecting method for segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly fit a dovetail groove and a connector without collision between the connector and a segment end even when the uninstalled segment is slid roughly. <P>SOLUTION: In the connecting structure of the segments in which a connecting device L mutually connecting the adjacent segments S1 and S2 for a tunnel in the tunnel peripheral direction by fitting the connector R installed at the peripheral end section of one segment S2 and the dovetail groove section 18 formed at the peripheral end section of the other segment S1 by a relative sliding movement in the tunnel-axis direction of both segments is mounted, a positioning mechanism (i) mutually positioning both segments S1 and S2 in the relative sliding movement direction by fitting a guide pin 21 fixed in front of the connector R and the dovetail groove 18 prior to the fitting of the dovetail groove 18 and the connector R by the relative sliding movement of both segments S1 and S2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connection structure and a connection method for tunnel segments, and more particularly to a technique for smoothly performing a connection operation in a circumferential direction between segments.
[0002]
[Prior art]
Conventionally, as for the connection of the tunnel segments, as shown in Japanese Patent Application Laid-Open No. Hei 11-93588, the segments adjacent in the circumferential direction of the tunnel are moved relative to each other in the direction of the tunnel axis by sliding the two segments. A connecting device that is fitted to a circumferential end of one of the segments and a dovetail groove formed at the circumferential end of the other segment to fit and connect the connecting device to the circumferential direction of the segment. The one provided at each end and both ends in the tunnel axial direction is known.
[0003]
[Problems to be solved by the invention]
In the above-mentioned prior art, as shown in FIGS. 3 and 5 of the above-mentioned publication, an unsegmented segment is slid in the tunnel axial direction with respect to an existing segment to fit the connecting tool and the dovetail groove of the segment. Will be combined. In this case, since the connecting member is overhanging on the moving path of the segment, it is necessary to slide the non-installed segment while accurately aligning the non-installed segment so that the corners of the non-installed segment do not collide with the connecting device. The slide operation was tricky.
[0004]
That is, since the fitting portion between the coupling tool and the dovetail portion is located at the end in the circumferential direction of the tunnel and at both ends in the axial direction of the tunnel, and the fitting of these two locations is started simultaneously or almost simultaneously. , The slide movement path between the dovetail groove and the connection part, that is, the unsegmented segment, must be set very accurately from the start of the slide operation, and the preparation work is time-consuming and cumbersome. Met. If the slide movement path is deviated, the connecting tool may be deformed or damaged, and the intended connection may not be performed, so that there is room for further improvement in the connection structure of the segments. Seems to be.
[0005]
In view of the above situation, the present invention relates to a configuration in which segments adjacent in the circumferential direction of the tunnel are relatively slid in the axial direction of the tunnel so that the coupling tool and the dovetail groove are fitted to each other. It is an object of the present invention to provide a connection structure and a connection method capable of smoothly fitting a dovetail groove and a connection tool without colliding between the connection tool and a segment end even when the connection tool slides in a positioning state.
[0006]
[Means for Solving the Problems]
As shown in FIGS. 1, 3 and 5, the structure of claim 1 allows the two adjacent segments S1 and S2 in the tunnel circumferential direction X to slide relative to each other in the tunnel axial direction Y. A connecting tool R provided at a dovetail groove 18 formed at a circumferential end of one of the segments S1 and S2, and a dovetail groove 18 formed at a circumferential end of the other segment S1. A connection structure of a segment provided with a connection device L for fitting and connecting
A guide member 21 having a tip that can be fitted into the other dovetail portion 18 is attached to one of the dovetail portions 18 or at a position near the dovetail portion 18, and the two segments S1 and S2 are relatively slid. The guide member 21 is fitted into the other dovetail portion 18 prior to the fitting of the dovetail portion 18 and the connector R, thereby forming a positioning mechanism i for positioning the segments S1 and S2 in the tunnel radial direction. It is characterized by having.
[0007]
According to the configuration of the first aspect, when the segments are slid relative to each other, first, both segments are positioned in the radial direction of the tunnel by the positioning mechanism, and fitting of the dovetail groove and the coupling tool is started in the positioned state. Since the positioning mechanism serves as a guide, the corners of the segments do not come into contact with the connector, and the dovetail groove and the connector are smoothly fitted.
[0008]
In this case, if the relative sliding movement direction between the two segments is shifted from the predetermined path before the positioning mechanism operates, the positioning mechanism may be damaged due to a collision with a corner of the segment or the like. However, even if this is the case, the positioning mechanism is damaged, and the connecting tool is safe. Therefore, it is convenient that the connecting operation can be redone by carefully performing the slide operation again. In addition, the positioning mechanism uses the existing dovetail groove, so it is only necessary to attach a guide member, and it is possible to reduce the number of parts and simplify the structure compared to the case where it is provided exclusively. become.
[0009]
5 and 8, the guide member 21 is formed in a shape that can be inserted into and removed from the dovetail groove portion 18 in the tunnel circumferential direction X. It is characterized by the following.
[0010]
According to the configuration of claim 2, since the guide member can be freely inserted into and removed from the dovetail groove in the circumferential direction of the tunnel, a detailed description will be given in the section of the embodiment. A first moving step of moving the segment S2 in the circumferential direction of the tunnel and inserting the guide pin 21 into the dovetail groove 18 of the first joint j1n from the side is performed (see FIG. 13A), and then, the positioning is performed by the positioning mechanism i. In this state, a second moving step of moving the unconnected segment S2 in the tunnel axis direction to operate the connecting device L can be performed [see FIG. 13 (b)].
[0011]
In other words, the connection between the guide member and the dovetail groove can be performed not only by one-way movement of moving the segment in the tunnel axis direction but also by combined movement of the tunnel circumferential direction and the tunnel axis direction. Can be arranged at an intermediate portion in the tunnel axis direction without opening the segment in the tunnel axis direction, thereby enlarging a variety of segment connection operation variations.
[0012]
According to a third aspect of the present invention, as shown in FIGS. 1, 3 and 5, the tip 21a of the guide member 21 and the inner back wall 25 of the dovetail groove 18 can be in sliding contact with each other. The shape and dimensions of the guide member 21 and the dovetail groove 18 are set so that the relative sliding movement is performed in the state, so that the segments S1 and S2 are positioned in the circumferential direction of the tunnel. Things.
[0013]
According to the third aspect of the present invention, both segments are positioned in the circumferential direction of the tunnel in a state where the tip of the guide member and the inner deep wall of the dovetail groove can slidably contact with each other. Sliding contact between the tip of the member and the inner wall of the dovetail groove determines the relative position in the tunnel circumferential direction as well as the relative position of both segments in the tunnel radial direction.
[0014]
This is particularly effective when assembling trapezoidal segments whose end faces in the tunnel circumferential direction in the segments are inclined with respect to the tunnel axial direction. In other words, in the connection of trapezoidal segments, the relative position in the circumferential direction of the tunnel cannot be determined until immediately before the connection is completed. However, there is a disadvantage that a jig is required to separately guide the joints, or the segments are wobble, and the connecting operation is performed while the end faces in the circumferential direction come into contact with each other. It will be eliminated.
[0015]
As illustrated in FIG. 15, in the configuration of claim 4, in the configuration of claims 1 to 3, the segment S is tunneled in the segment main body h in a state where the segment main body h made of concrete and the dovetail groove 18 are formed. A screw hole 28 for screwing the anchor member 26 to the segment main body h is formed in the connected metal member J, and a screw hole 28 for screwing the anchor member 26 in the screw hole 28 is formed. The portion opposite to the attachment side is set to the screwing portion 29 of the guide member 21.
[0016]
According to a fourth aspect of the present invention, when the segment main body is made of concrete, the connected metal fitting having the dovetail groove and the fixing structure thereof are defined, and the connected metal fitting is firmly attached to the segment main body using an anchor member. The general means of integration is applied. In this case, a screw hole is formed for screwing and fixing the anchor member to the connected metal fitting. Therefore, by using the screw hole as a screwing portion of the guide member, any one of the anchor member and the guide member can be used. It is possible to omit the dedicated fixing means.
[0017]
According to the configuration of claim 5, one of the segments S2 of the two segments S1 and S2 is moved relative to each other by sliding relative to each other in the tunnel axial direction Y. A connecting device L is provided for fitting and connecting the connecting tool R mounted on the dovetail groove 18 formed at the circumferential end and the dovetail groove 18 formed at the circumferential end of the other segment S1. ,
Each of the segments S1 and S2 is composed of a concrete segment main body h and connected metal fittings J and J integrally provided at an end of the segment main body h in the tunnel circumferential direction X in a state where the dovetail groove portion 18 is formed. In the connection structure of the segment
Convex portions 34, 34 are integrally formed on one of the connected metal fittings J, J, and concave portions 35, 35 which can be fitted to the convex portions 34, 34 are formed on the other connected metal fitting J. The projections 34, 34 and the recesses 35, 35 are fitted together before the dovetail groove 18 and the connector R are fitted by the relative sliding movement of the segments S1, S2, so that both segments S1 and S2 are fitted together. , S2 in the tunnel radial direction.
[0018]
The structure according to claim 5 relates to a segment having a structure in which a metal fitting is embedded in a concrete segment main body, and according to this structure, when the segments are slid relative to each other, the two segments are firstly moved by the positioning mechanism. The positioning is performed in the radial direction of the tunnel, and the fitting between the dovetail groove and the connecting tool is started in the positioned state. Since the positioning mechanism serves as a guide, the corner of the segment and the connecting tool are in contact with each other. Without hitting, the dovetail groove and the connector are smoothly fitted.
[0019]
In this case, if the relative sliding movement direction between the two segments is shifted from the predetermined path before the positioning mechanism operates, the positioning mechanism may be damaged due to a collision with a corner of the segment or the like. However, even if this is the case, the positioning mechanism is damaged, and the connecting tool is safe. Therefore, it is convenient that the connecting operation can be redone by carefully performing the slide operation again. Further, the positioning mechanism, which can be called a rail guide mechanism by fitting a convex portion formed on one of the connected metal fittings via a connecting tool with a concave portion formed on the other, is an existing structure. Since it is based on the shape of the connected metal fittings, there is no new additional member, and the number of components can be reduced and the structure can be simplified as compared with a case where a separate member is provided to constitute the positioning mechanism.
[0020]
Note that, as described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the tunnel ring TR, and FIG. 3 is a view showing the operation of assembling the tunnel segments. The tunnel ring TR is formed by sequentially connecting and integrating substantially arc-shaped segments S1 to S8 in a tunnel axial direction Y and a tunnel circumferential direction X according to a certain rule. The tunnel axis direction Y is the direction of the virtual axis of the tunnel ring TR having a circular shape, and is also the longitudinal direction of the tunnel.
[0022]
A unit ring tr composed of one segment in the tunnel axial direction Y has eight A-type segments S1 to S5, two B-type segments S6, S7, and one K-type segment S8, for a total of eight. It is formed from segments S1 to S8, and is connected and integrated by a connecting device L using a plurality of connecting tools R. The segments adjacent to each other in the tunnel axial direction Y are connected by a female part 3 formed on the face-side arc side surface 4 of each of the segments S1 to S8 and a male member 2 mounted on the entrance-side arc side surface 5. It is connected and integrated by the mechanism 1.
[0023]
Each of the A-type segments S1 to S5 has a standard circular arc shape in which both end surfaces 6, 7 in the circumferential direction are formed on a surface parallel to the tunnel axis direction Y. , Are assembled continuously in the circumferential direction. The circumferential end faces of the A-type segments S1 to S5 are formed so as to coincide with the radiation centered on the tunnel axis direction Y when viewed in the tunnel axis direction. The same applies to the end surface on the mold segment side.
[0024]
The B-type segments S6 and S7, which are the sixth and seventh segments, include a reference end face 8 formed parallel to the tunnel axial direction Y to be connected to the fourth or fifth A-type segment S4 or S5, and an eighth segment. A trapezoidal shape having inclined end surfaces 9 and 10 which are inclined such that the circumferential length of the face side arc side surface 4 is shorter than that of the entrance side arc side surface 5 so as to be connected to a certain K-shaped segment S8. Is configured.
[0025]
The K-shaped segment S8 is opposite to the inclined end faces 9, 10 so that the circumferential end faces 11, 12 fit the inclined end faces 9, 10 of the B-shaped segments S6, S7 arranged on both sides thereof. Constructed in trapezoidal shape formed on tapered surface with orientation angle
Have been. Next, a procedure for assembling the segments will be described.
[0026]
The basic structure of all the segments is the same, and as a representative, the first A-type segment S1 will be described. The front and rear ends (the tunnel axial direction Y) of the left and right ends (the tunnel circumferential direction X ends) of the concrete (RC) segment body h In each of the end portions), a total of four cast iron joints J (an example of metal fittings) into which the coupling tool R can be engaged are embedded and integrated. Two of them are the first joints j1n or j1t provided with the connecting tool R and the guide pins 21 (an example of a guide member), and the other two are the second joints j2n and j2t.
[0027]
As shown in FIG. 3, the assembling order of the non-established segments S1 to S8 to the existing segment, the tunnel ring TR, is as follows: first, the middle A-type segment S1 is assembled to the tunnel ring TR; The A-type segment S2 is mounted on the left side, the A-type segment S3 is mounted on the right side, and the A-type segment S5 is mounted on the left side of the second mounted A-type segment S2.
[0028]
Then, the A-type segment S4 is assembled to the right of the third A-type segment S3, and the left B-type segment S6 is assembled to the fourth A-type segment S5. The unit ring tr is completed by assembling the right B-segment S7 next to the assembled A-segment S4 and finally assembling the K-segment S8 between the left and right B-segments S6 and S7. Thus, it becomes a new component of the tunnel ring TR.
[0029]
The assembly of these segments is performed by using a hydraulic jack (shield jack) 20 for pushing in, but depending on the location, a hydraulic jack for steadying (in FIG.
Omitted). Next, the connecting device L for connecting the segments S adjacent to each other in the circumferential direction, the joint J at which the connecting tool R in each segment S is engaged, and the peripheral structure thereof will be described.
[0030]
As shown in FIGS. 3 and 5, the connection between the segments adjacent in the circumferential direction, for example, the connection between the first A-type segment S1 and the second A-type segment S2 is performed by connecting the second A-type segment to the existing first A-type segment S1. This is performed by sliding S2 in the tunnel axial direction, and both S1 and S2 are connected by a connecting device L using a pair of connecting tools R provided at both ends in the tunnel circumferential direction X.
[0031]
As shown in FIG. 2, a substantially rectangular connecting tool R with projections in plan view has enlarged edges 13, 13 formed on both right and left edges in the pushing direction Z, and a flat plate between them. It is composed of a body 14 and a backup material 15 attached to one of the enlarged edges 13. At the boundary between each enlarged edge portion 13 and the body portion 14, a holding portion 16 having a tapered surface shape for firmly attracting the segments S together with the connecting operation is formed, and the left and right holding portions 16, 16 are connected to each other. Are set to be wider toward the lower side in the pushing direction Z. Further, on the outer surface of the enlarged edge portion 13 having the backup material 15, a regulating member 17 for regulating a change in the posture of the connecting member R at the time of a pushing operation on a joint J (to be described later) embedded in the segment S is integrally formed. Is formed.
[0032]
The backup material 15 is provided at one end of the two enlarged edges 13, 13, and the projecting direction thereof is set substantially parallel to the pushing direction Z of the connecting tool R. The reason why the backup material 15 is provided only on one of the enlarged edges 13 in this manner is that the connector R is substantially pushed in on the face side on the face side end of the dovetail groove portion 18 of the face side joint J in the segment to be pushed in. This is because the reaction force receiving portion 19 is formed at the wellhead side, and at the wellhead side, the reaction force receiving portion 19 is formed at the wellhead side end of the dovetail groove portion 18 of the wellhead side joint J in the existing segment.
[0033]
As shown in FIG. 2, the backup material 15 is attached to the rear end of the enlarged edge portion 13 by a screw portion n, but may be press-fitted and fixed, or may be attached using an adhesive or the like. It may be fixed by bonding. In addition, the backup material 15 may be provided at the rear ends of the enlarged edges 13, 13. The backup material 15 is formed of, for example, a hollow cylindrical member. The backup material 15 receives, for example, a predetermined pressing force from the existing tunnel ring TR in the case of the wellhead-side connecting tool R1 and a predetermined pressing force from the reaction force receiving portion 19 in the case of the face-side connecting tool R2. As shown in FIG.
[0034]
That is, when the connecting tool R is pushed in, for example, the first A-type segment S1 and the second A-type segment S2 are gradually attracted in the tunnel circumferential direction, and accordingly, the force required to push the connecting tool R increases. I do. During this time, the pressing force acting on the backup material 15 also increases, and the backup material 15 is elastically deformed. However, when the pressing force reaches a predetermined value, plastic deformation of the backup material 15 starts to occur, and the pressing force does not increase. In this state, the fastening force by the connecting tool R no longer increases, and the force for attracting both segments S1 and S2 is kept constant.
[0035]
As shown in FIGS. 3 to 5, the joint J made of cast iron has a first joint j1 having a long length on the side to which the connecting tool R is attached first, and a connecting tool R with the connecting operation of the segments. Is inserted into the second joint j2 having a short length. Each of the joints j1 and j2 has a normal shape j1n and j2n applied to the A-type segments S1 to S5 and a trapezoidal shape applied to the inclined end faces 9 to 12 of the B-type and K-type segments S6 to S8. There are two types, j1t and j2t, but the basic structure is the same.
[0036]
As shown in FIG. 11, the shape of the dovetail groove portion 18 in the joint J is such that the portion other than the pinched portion 23 of the connecting member R with respect to the holding portion 16 does not need to be in close contact with the connecting member R. It is formed so as to be provided. Accordingly, the portion other than the clamped portion 23 may be in the cast-free state, the cutting allowance for forming the clamped portion 23 is reduced, and the workability of the cutting operation is improved.
[0037]
As shown in FIGS. 4 and 5, each joint J has a dovetail groove 18 which is a substantially C-shaped space portion in a front view (viewed in the tunnel axis direction Y), and a pair of upper and lower (one may be used) anchor projections 24. And a pair of (or one) anchor bolts 26, 26, and an enlargement of the connecting tool R to the joint J above and below a position outside the dovetail groove 18 (on the outer end side). A sandwiched portion 23 is formed, with which the sandwiching portion 16 abuts as the edge 13 is inserted. Due to the inclination of the holding portion 16 and the held portion 23, a force for attracting the segments S1 and S2 is generated with the connection operation of the segments S, and thereby the retaining action of the connecting tool R is exerted. ing.
[0038]
The normal and trapezoidal first joints j1n and j1t are formed such that the half of the length of the dovetail groove 18 on the inner side of the segment is formed in a U-shape in front view by omitting the clamped portion 23. Thus, an opening 27 for inserting the connecting tool R into the dovetail groove 18 from the circumferential outer side of the segment S is formed (see FIGS. 7 and 12). A reaction force receiving portion 19 which is a side wall for receiving the backup material 15 of the connecting member R is formed at an end of the joint portion 23 in the longitudinal direction of the joint. A guide pin 21 (an example of a pin member) that can be screwed to the vertical wall portion 22 that is located inside the dovetail groove 18 is provided at a position of the opening 27 that is closer to the held portion 23.
[0039]
As shown in FIGS. 4 and 8, the guide pin 21 is a rod member having a thread part 21 a on the base side, a flange part 21 b, and a pin part 21 c, and the tip part of the pin part 21 c is a segment S. Is screwed to the vertical wall portion 22 in a state in which the length is set so as to protrude from the circumferential end surfaces 6 to 12 of the vertical direction. The not-shown recess at the tip of the guide pin 21 is a linear notch for turning operation with a flathead screwdriver or the like. Accordingly, as a procedure for assembling the connecting tool R and the guide pin 21, first, the connecting tool R is fitted into the dovetail groove 18 of the portion to be clamped 23 from the opening 27 (see FIG. 7). Is screwed to the vertical wall portion 22 (see FIG. 8). In the trapezoidal first joint j1t, the length of the guide pin 21 is slightly increased.
[0040]
The normal type and trapezoidal type second joints j2n and j2t can fit the enlarged edge portion 13 of the connecting tool R from the face side arc side surface 4 or the entrance side arc side surface 5 (see FIG. 9), so that the first joint j1 , The pinched portion 23 is formed over the entire length thereof, and there is no portion corresponding to the opening 27 of the first joint j1. If a joint is to be placed in the opening, an opening 27 is required). That is, the positioning mechanism i is configured by the guide pins 21 of the first joints j1n and j1t and the dovetail groove 18 of the second joints j2n and j2t.
[0041]
Thus, as shown in FIG. 9, the second (third) A-type segment S2 is fitted to connect the second joint j2n to the first joint j1n provided with the connecting tool R and the guide pin 21. When (S3) is slid in the tunnel axis direction Y, the dovetail groove 18 of the first A-type segment S1 and the connecting tool R are performed by the guide action of the positioning mechanism i by the guide pin 21 and the dovetail groove 18. Can be started smoothly as expected without the disadvantage that the end face of the second joint j2n collides with the connecting tool R. FIG. 10 shows a state in which the engagement between the dovetail groove 18 and the connecting member R is completed. In this figure, the backup member 15 is not deformed.
[0042]
FIG. 12 shows a state where the seventh segment S7 of the B type (single taper type) and the eighth segment S8 of the K type (trapezoid type) are fitted and connected. In this case, the first segment of the trapezoidal type is used. And the second joint j1t, j2t. Also, as shown by the imaginary line in FIG. 12, the guide pin 21 is extended so that the distal end surface 21a and the inner back wall (vertical wall) 25 in the dovetail portion 18 of the second joint j2t are substantially flush. If the dimensions are set (so that a slight clearance exists), the relative sliding movement while exerting the guiding action between the tip end surface 21a of the guide pin 21 and the inner back wall 25 of the dovetail groove 18 that can be relatively slid into contact with each other is performed. This has the advantage that the seventh segment S7 and the eighth segment S8 can be positioned in the tunnel circumferential direction prior to the fitting of the connecting tool R and the dovetail groove portion 18.
[0043]
[Another embodiment]
<< 1 >> As shown in FIG. 13, the guide pins 21 are fixedly mounted in a reclined position by screwing or the like on the inner rear side in the tunnel axis direction of the second joints j2n and j2t on which the connecting tool R is not mounted, and are connected. The first joint j1n, j1t on the side where the tool R is mounted may be a positioning mechanism i having a structure in which the opening 27 has a long overall length. That is, the dovetail groove 18 of the first joint j1n, j1t and the guide pin 21 of the second joint j2n, j2t constitute a positioning mechanism i.
[0044]
In this case, as shown in FIG. 13A, first, the segment S2, which is not provided, is moved in the circumferential direction of the tunnel with respect to the existing segment S1, and the guide pin 21 is moved laterally into the dovetail groove 18 of the first joint j1n. 13B, and then moves the unprovided segment S2 in the tunnel axial direction in the state of being positioned by the positioning mechanism i to perform the connecting operation of the connecting device L, as shown in FIG. Two moving steps will be performed. That is, the cylindrical guide pin 21 is formed in a shape that can be inserted into and removed from the dovetail groove 18 in the tunnel circumferential direction X. This alternative embodiment <1> is not applicable to the eighth segment S8 that cannot move in the tunnel circumferential direction.
A
<< 2 >> As shown in FIG. 14 (a), a connecting member is provided at each of both ends in the tunnel axial direction on the circumferential end face 7 of one segment S1 of the segments S1 and S2 which are adjacent to each other in the tunnel circumferential direction. A coupling device having a structure in which first joints j1n and j1s having R and guide pins 21 are provided, and second joints j2n and j2s are provided at both ends of the circumferential end face 6 of the other segment S2 in the tunnel axial direction, respectively. L is also possible. This embodiment cannot be adopted for the eighth segment S8.
[0046]
In this case as well, in the same manner as in the above-described another embodiment <1>, the segment S2 which is not provided is moved in the circumferential direction of the tunnel, and the guide pin 21 on the face side and the connecting tool R are connected to the dovetail groove of the second joint j2s. After the insertion of the connecting device 18 in the tunnel 18, the segment S2, which is not provided, is moved in the axial direction of the tunnel, and the connecting device L is connected. Accordingly, the first joint j1s on the face side can be inserted into the coupling tool R from the opening on the face side end of the dovetail groove 18, so that the first joint j1s is set to be a short special type having the same length as the normal type second joint j2n. The second joint j2s on the face side is formed with an opening 27 for inserting the guide pin 21 and the connecting member R from the lateral side, and is as long as the normal type first joint j1n. It is set to a special type.
[0047]
<< 3 >> As shown in FIG. 15, a screw hole 28 for screwing an anchor bolt (an example of an anchor member) 26 to the segment main body h is formed in the joint J, which is a connected metal fitting, and the anchor member 26 screw in the screw hole 28 is formed. The portion opposite to the attachment side may be set to the screw portion 29 of the guide member 21. That is, the arrangement position of the anchor bolt 26 and the arrangement position of the guide pin 21 are set to coincide with each other, thereby omitting one dedicated screw portion, thereby simplifying the structure and reducing the cost. It is possible.
[0048]
<< 4 >> The present invention is also applicable to segments made of cast iron such as ductile. In this case, each joint J is formed integrally with the segment body.
[0049]
<< 5 >> The pin member 21 is formed, for example, to have a pointed shape in the side view on the upper side in the relative sliding movement direction of the segments S, S, and allows the positional deviation with the dovetail groove 18, that is, the positioning mechanism. The range of action as i may be expanded.
[0050]
<< 6 >> The present invention is also applicable to a structure in which the connecting tool R and the guide pin 21 are integrally formed with the segment S. As the positioning mechanism i, a convex rail portion is provided on the circumferential end surface 6 of one segment S, and a concave rail portion is provided on the circumferential end surface 7 of the other segment S. Various changes are possible, such as a special one using a rail structure.
[0051]
<< 7 >> As shown in FIG. 14 (b), by inserting the connecting tool R with the left and right reversed from the case shown in FIG. 14 (a), the connection with the side surface (face side surface) of the existing segment S is performed. The structure may be such that a reaction force acts on the backup material 15 by this. In this case, the reaction force receiving portion 19 of the first joint j1n may be omitted.
[0052]
<< 8 >> As shown in FIG. 16, using a double stop type first joint j1q in which the bolt seat 30 is formed on the inner side and a long type second joint j2q extending on the inner side, A bolt seat 30 having upper and lower constricted surfaces 31, 31 which are the clamped portions 23 of the two joints j2q and a head portion 32A having a size just fitted between the constricted surfaces 31, 31. The positioning mechanism i may be constituted by a screw (an internal hexagonal bolt is also possible) 32 screwed to.
[0053]
<< 9 >> As shown in FIG. 17, a special type of first joint j1r having a long-type first joint j1r extending from the held portion 23 and a projection 33 that can be fitted to the held portion 23 of the first joint j1r. Using the two joints j2r, the projections 33 are fitted into the clamped portions 23 prior to the engagement between the dovetail groove portion 18 and the connector R by the relative sliding movement of the segments S1 and S2. You may comprise the positioning mechanism i which positions S2 in the tunnel radial direction.
[0054]
<< 10 >> As shown in FIGS. 18 to 20, the protrusions 34, 34, which are an example of a pair of upper and lower protrusions, are integrally formed on the projection-type first joint j1p of the first and second joints j1p, j2p. The upper and lower long recesses 35, 35, which can be fitted to the ridges, are formed integrally with the second joint j2p, so that the relative sliding movement of both segments S1, S2 allows the dovetail groove 18 to be fitted to the connecting member R. Prior to this, the positioning mechanism i for positioning the segments S1 and S2 in the tunnel radial direction may be formed by fitting the ridges 34 and 34 and the recesses 35 and 35.
[0055]
【The invention's effect】
In the segment connecting structure according to the first aspect, the positioning mechanism using the existing dovetail groove as a component performs positioning of the two segments in the direction of relative sliding movement prior to the fitting of the dovetail groove and the connector. After the positioning mechanism is actuated, the segments only have to be slid and moved.Since the accurate positioning operation can be omitted and the connecting operation is simple, the dovetail groove and the connecting tool can be connected. What could be smoothly fitted and connected could be obtained while simplifying the structure and reducing the cost.
[0056]
In the segment connecting structure according to the second aspect, the effect of the configuration according to the first aspect is exhibited, and the operation of inserting and removing the dovetail groove and the connecting tool is performed not only when the moving direction between the segments is not only in the tunnel axial direction but also in the tunnel peripheral direction. Since it can be performed in the direction, the degree of freedom of the segment connecting operation is increased, and the one that can contribute to the improvement of the connecting operability and the work efficiency is obtained.
[0057]
In the segment connection structure according to the third aspect, the effect of any one of the first and second aspects is achieved, and the distal end of the guide member and the inner deep wall of the dovetail groove 18 are in sliding contact with each other in the circumferential direction of the tunnel. Therefore, there is an advantage that the guide function of the positioning mechanism is enhanced and a more accurate connecting operation can be performed, and the connecting operability of the trapezoidal segment is greatly improved.
[0058]
In the segment connecting structure according to the fourth aspect, any one of the effects of the configuration according to the first to third aspects is achieved, and the mounting means for both the anchor member and the guide member of the metal fitting to be connected in the concrete segment is a female screw portion. And the like can be shared by one screwing portion, and the rationalization can be further achieved.
[0059]
In the connecting structure of the segments according to the fifth aspect, prior to the engagement between the dovetail portion and the connecting tool, the positioning of the two segments in the relative sliding movement direction is performed by the positioning mechanism using the existing constituent parts of the both connected metal fittings. Is performed, so that the segments only have to be slid after the operation of the positioning mechanism, so that the accurate positioning operation can be omitted and the dovetail groove and the connecting tool can be omitted. Can be smoothly fitted and connected while simplifying the structure and reducing the cost.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic structure of a tunnel segment.
FIGS. 2A and 2B show a connecting tool, wherein FIG. 2A is a plan view and FIG.
FIG. 3 is an explanatory diagram showing a connection mode of various segments.
4A and 4B show a first joint, a connecting tool, and a guide pin, wherein FIG. 4A is a perspective view before assembling, and FIG. 4B is a perspective view after assembling.
FIG. 5 is a perspective view of circumferential ends of a segment showing a coupling device and a positioning mechanism.
FIG. 6 is an operation diagram showing a backup material being deformed.
FIG. 7 is a partial cross-sectional view showing an attachment mode of the coupling tool.
FIG. 8 is a partial cross-sectional view showing a mounting mode of a guide pin.
FIG. 9 is a partially cutaway cross-sectional view showing the way in which segments are connected;
FIG. 10 is a partially cutaway sectional view showing a state where the segments have been connected.
FIG. 11 is a cross-sectional view taken along line aa of FIG. 10 showing a connection state of the connection device.
FIG. 12 is a partially cutaway sectional view showing a connection structure between a B-shaped segment and a K-shaped segment.
13A and 13B show a first alternative structure of the positioning mechanism, wherein FIG. 13A is an operation diagram of the first movement process, and FIG. 13B is an operation diagram of the second movement process.
14 (a) and 14 (b) are cross-sectional views showing another alternative structure of the positioning mechanism.
FIG. 15 is a partially cutaway sectional view showing another fixing means for fixing the anchor member and the guide member.
FIG. 16 is a sectional view showing a second alternative structure of the positioning mechanism.
FIG. 17 is a sectional view showing a third alternative structure of the positioning mechanism.
FIG. 18 is a perspective view of circumferential ends of segments showing a fourth alternative structure of the positioning mechanism.
FIG. 19 is a cross-sectional view showing a state where the segments shown in FIG. 18 have been connected.
20 is a sectional view taken along line bb of FIG. 19;
[Explanation of symbols]
18 Dovetail
21 Pin member
21a Tip surface
25 Inner back wall
26 Anchor member
28 screw hole
29 Screw part
34 convex
35 recess
h Segment body
i Positioning mechanism
J Connected bracket
L coupling device
R connector
S1, S2 segment
X Tunnel circumferential direction
Y Tunnel axial direction

Claims (5)

Tunnel segments adjacent to each other in the tunnel circumferential direction were mounted on a dovetail groove formed at the circumferential end of one of the two segments by a relative sliding movement of the two in the tunnel axial direction. A coupling structure of a segment provided with a coupling device for coupling and coupling a dovetail groove formed at a circumferential end of the other segment with a coupling device,
At one of the dovetails or at a position near the dovetail, a guide member having a tip that can be inserted into the other dovetail is attached, and the dovetail and the coupling tool are moved by relative sliding movement of the two segments. A segment connecting structure in which the guide member is fitted into the other dovetail portion prior to the fitting, thereby forming a positioning mechanism for positioning the two segments in the tunnel radial direction. 2. The segment connecting structure according to claim 1, wherein the guide member is formed in a shape that can be inserted into and removed from the dovetail groove from a circumferential direction of the tunnel. 3. In a state in which the tip of the guide member and the inner wall of the dovetail groove can slidably contact each other, the relative slide movement is performed so that the two segments are positioned in the tunnel circumferential direction. The segment connecting structure according to claim 1 or 2, wherein a shape and dimensions of the segment are set with the dovetail groove. The segment comprises a concrete segment main body and a connected metal fitting integrally provided at an end of the segment main body in a tunnel circumferential direction in a state where the dovetail groove is formed. 4. A screw hole for screwing an anchor member to a segment body, and a portion of the screw hole on a side opposite to the anchor member screw side is set to a screw portion of the guide member. A segment connection structure according to any one of the preceding claims. Tunnel segments adjacent to each other in the tunnel circumferential direction were mounted on a dovetail groove formed at the circumferential end of one of the two segments by a relative sliding movement of the two in the tunnel axial direction. A coupling device is provided with a coupling device for coupling and coupling a dovetail groove formed at a circumferential end of the other segment,
A segment connecting structure comprising a segment main body made of a concrete segment main body and a connected metal fitting integrally provided at an end of the segment main body in a tunnel circumferential direction in a state where the dovetail groove is formed. So,
A convex portion is integrally formed on one of the connected metal fittings of the two connected metal fittings, and a concave portion that can be fitted to the convex shape is integrally formed with the other connected metal fitting, and the two segments are moved by relative sliding movement. Prior to the fitting between the dovetail portion and the connecting member, the projections and the recesses are fitted to each other to connect the segments forming a positioning mechanism for positioning the two segments in the tunnel radial direction. Construction.

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